Cells use membranes to help maintain set ranges of ion concentrations inside and outside the cell. Which of the following ions is the most abundant inside a typical mammalian cell?
(a) Na+
(b) K+
(c) Ca2+
(d) Cl–
(b)
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Which of the following proteins-functions is mismatched?
A. DNA polymerase-DNA synthesis. B. DNA polymerase-primer removal and replacement with DNA. C. DNA primase-production of RNA primer. D. topoisomerase-separates double-stranded DNA into single strands. E. single-stranded binding proteins-prevents single DNA strands from reforming into a double helix.
In the internal leaf structure shown above, the item labeled "3" is
a. a vascular bundle. b. spongy mesophyll. c. epidermis. d. a stoma. e. palisade mesophyll.
What is the evidence that exists to support the idea that the greater area of the tropics is the reason for higher diversity?
A) The land mass is greater at the equator than elsewhere on Earth. B) The area of the Atlantic Ocean is greater at the equator. C) There are more mountainous areas in the tropics, creating more surface area. D) The area between 0° and 10° is greater than between 60° and 70° latitude.
The circulatory system aids in the homeostasis of the skeletal system by
a) delivering calcium b) delivering phosphate c) transporting hormones for bone metabolism d) transporting hormones for production of red blood cells e) all of the above